300WM Rem Nickel Case Problem- Need Help

[Here2Learn]

Does anyone know what might be causing the dent right below the shoulder? Regular brass does not do this. No primer pressure signs

Ammo Specs:
200 SMK
Rem Nickel Brass
67gr IMR4350
2750fps
Seated .015 off lands

Gun Specs
26" Hart
Rem700 Action

 

[KTDLS7]

Re: 300WM Rem Nickel Case Problem- Need Help

I have not seen this before. Is the chamber clean, as in using a chamber brush? Free of lubricants?

You will probably get much better results by moving this to the reloading section.

Kevin

 

[Rprecision]

Re: 300WM Rem Nickel Case Problem- Need Help

your muzzle velocity is too high ! When the bullet leave the barrel it sucks on the case so hard it collapses the shoulder.

I had that before..........










Seriously I have never seen that

 

[Here2Learn]

Re: 300WM Rem Nickel Case Problem- Need Help

I wouldn't think 67 grains of IMR4350 going 2750 would be too much pressure but I could be wrong. It seems like it would show up as a flat or cratered primer.

 

[Rprecision]

Re: 300WM Rem Nickel Case Problem- Need Help

so just confirming the cases go in perfect and come out like that ?

 

[Here2Learn]

Re: 300WM Rem Nickel Case Problem- Need Help

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Rprecision</div><div class="ubbcode-body">so just confirming the cases go in perfect and come out like that ? </div></div>

That's correct.

 

[wchartz]

Re: 300WM Rem Nickel Case Problem- Need Help

I suspect that your case necks are hard and your pressure is too low letting gases leak by the neck causing the dent. Since your load is mild according to published data and you state that there are no signs of excess pressure I would up the charge and shoot again. Let us know how this comes out it is an unusual problem.

 

[Rprecision]

Re: 300WM Rem Nickel Case Problem- Need Help

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wchartz</div><div class="ubbcode-body">I suspect that your case necks are hard and your pressure is too low letting gases leak by the neck causing the dent. Since your load is mild according to published data and you state that there are no signs of excess pressure I would up the charge and shoot again. Let us know how this comes out it is an unusual problem.</div></div>

well, that the only thing that would make any sense.

Thinking about it, why would there be that much of a differnce in pressure between the barrel and case, pressure would be the same?

 

[Huckleberry75]

Re: 300WM Rem Nickel Case Problem- Need Help

Case is the weaker link. Barrel is much more rigid and less likely to flex, vs. the case.

Make sure that you don't have somethign stuck in your chamber like a stray piece of tumbling media or other debris. Excess lube would cause the case to not seal off the pressure, but blow by usually results in powder fouling on the outside of the cases.

 

[Here2Learn]

Re: 300WM Rem Nickel Case Problem- Need Help

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Huckelberry75</div><div class="ubbcode-body">Case is the weaker link. Barrel is much more rigid and less likely to flex, vs. the case.

Make sure that you don't have somethign stuck in your chamber like a stray piece of tumbling media or other debris. Excess lube would cause the case to not seal off the pressure, but blow by usually results in powder fouling on the outside of the cases.</div></div>

I should have said this before but it is not every case. One out of 10 or so make the dent in the case.

 

[X-fan]

Re: 300WM Rem Nickel Case Problem- Need Help

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Here2Learn</div><div class="ubbcode-body">I wouldn't think 67 grains of IMR4350 going 2750 would be too much pressure but I could be wrong. It seems like it would show up as a flat or cratered primer. </div></div>
The pressure is fine.
To be honest IMR-4350 is a bit of an odd selection for the combination selected and may be adding to the difficulties. Rl-22, H-1000, H-4831 are all much better selections.
Be that as it may Hodgdon shows 200 Partition over 69.5 grains for a max velocity of 2860fps. Not the same bullet, but the peak velocities will be in a similar ballpark.

Most likely the problem comes from cases that are as hard as the hubs of hell. You can thank the nickle for that.
Anneal them or throw them is the garbage.
Nickle cases don't get used in my rifles.

Unless I miss my guess you are also splitting the odd case neck?

Good luck

 

[softcock]

Re: 300WM Rem Nickel Case Problem- Need Help

> ..." <span style="font-style: italic">I should have said this before but it is not every case. One out of 10 or so make the dent in the case</span> ".
-
<span style="font-weight: bold">That because not all the Cases are non-pliable & to hard in the Neck & shoulder .

( <span style="font-size: 11pt">wchartz</span> ) is correct . the Elasticity is no good in some of the Brass for proper expansion & contraction when fired . & Gas is shooting down past the Necks & denting some the Cases .</span>
.

 

[rman1]

Re: 300WM Rem Nickel Case Problem- Need Help

I have seen this before. You pressure is too low. Bump up your powder charge, or change powders, and the problem will go away.

R.

 

[Here2Learn]

Re: 300WM Rem Nickel Case Problem- Need Help

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wchartz</div><div class="ubbcode-body">I suspect that your case necks are hard and your pressure is too low letting gases leak by the neck causing the dent. Since your load is mild according to published data and you state that there are no signs of excess pressure I would up the charge and shoot again. Let us know how this comes out it is an unusual problem.</div></div>

I'll up the powder some and report back. Thanks all for the help

 

[X-fan]

Re: 300WM Rem Nickel Case Problem- Need Help

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Rman1</div><div class="ubbcode-body">I have seen this before. You pressure is too low. Bump up your powder charge, or change powders, and the problem will go away.

R. </div></div>
IMR-4350 gets twitchy in the 300 Win with heavy bullets...Go EASY!

He is running between 57-60kpsi...Its not the pressure, but may be the burn rate and its affect at the current operating pressure. More pressure may indeed seal the case, but see the above note!
I think your advise about switching powders is the best bet.

I would bet serious money that the cases are hard as hell.

 

[rman1]

Re: 300WM Rem Nickel Case Problem- Need Help

I shoot nickle cases almost exclusively, and have not had any issues with hardness. The plating on the brass, IMO, is too thin to cause much of an issue.
I would re-recommend the powder change.

In a 300WM, RL22 should give great results, without much hassle.

R.